On Church and Public Policy : What is the Churches Role?

So in all honesty, part of my decision to attend law school is born out of my dissatisfaction with the ability of the church to effect real change.  I'm probably a little jaded in this area, but I think statistics concerning behavior of church attenders and non-church attenders would back me up.

That said, in-spite of everything, I believe in the church.   I love the church, and despite my reservations, I know that it can be a change agent in the culture and in public policy.

So what is the churches role?  I do think that in many respects the church has a separate and distinct mission.  But at the same time, the ultimate aims of public policy and church often overlap.  What follows are several ways I think that churches can contribute to the health of their communities by contributing to the dialog on public policy in constructive ways.